MESON Chess Problem Database

Problem Display
PID: 238293 (BB1q3r/2R5/6Q1/KP6/5k1r/3p2Np/3P4/4R3 w - - 0 1)

Segers, Marcel

Shakhmaty v SSSR, 1935

BB1q3r/2R5/6Q1/KP6/5k1r/3p2Np/3P4/4R3

#2

9 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qg5
      • 2.Rc4#
    • 1...Qf6
      • 2.Rc4#
    • 1...Qxc7+
      • 2.Bxc7#
    • 1...Qe7
      • 2.Rc4#
    • 1...Qd4
      • 2.Rf7#
    • 1...Qd5
      • 2.Rf7#
    • 1...Qd6
      • 2.Rc4#
      • 2.Rf7#
    • 1...Qd7
      • 2.Rc4#
    • 1...Qxb8
      • 2.Rc4#
      • 2.Rf7#
    • 1...Qc8
      • 2.Rc4#
      • 2.Rf7#
      • 2.Rxc8#
    • 1...Qe8
      • 2.Rc4#
      • 2.Rf7#
    • 1...Qf8
      • 2.Rc4#
      • 2.Rf7#
    • 1...Qg8
      • 2.Rc4#
      • 2.Rf7#
      • 2.Rc8#
  • Tries
    • 1.Ka4?
      • threat
        • 2.Rc4#
        • 2.Rf7#
      • 1...Qxc7
        • 2.Bxc7#
      • 1...Qg5
        • 2.Rc4#
      • 1...Qd5
        • 2.Rf7#
      • 1...Qf6
        • 2.Rc4#
      • 1...Qe7
        • 2.Rc4#
      • 1...Qd7
        • 2.Rc4#
      • 1...Qd4+!
    • 1.Qg5+?
      • 1...Qxg5
        • 2.Rc4#
      • 1...Kxg5!
  • Keys
    • 1.Qg7!
      • threat
        • 2.Rf1#
      • 1...Qxc7+
        • 2.Bxc7#
      • 1...Qg5
        • 2.Rc4#
      • 1...Qd5
        • 2.Rf7#
      • 1...Rg4
        • 2.Qe5#
      • 1...Qf6
        • 2.Rc4#
      • 1...Qd4
        • 2.Rf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 2
  • Sets
    • Q(e);N_PINR(G),P_PINP(E)::B(I)+R(G),DCHECK
    • Q(e);N_PINR(G)::B(I)+R(G),DCHECK
    • Q(e);CHECK,OGATE,P_SPINQ(e),XR(G)::B(I),XQ(e)
  • Tries
    • Try
      • K(D);N_SPINR(G),P-FLIGHT
      • Threat
        • DUALS(2)
      • Vars
        • Q(e);OGATE,P_SPINQ(e),XR(G)::B(I),XQ(e)
        • Q(e);::B(I)+R(G),DCHECK
        • Q(e);P_PINP(E)::B(I)+R(G),DCHECK
      • Refutation
        • Q(e);CHECK
    • Try
      • Q(F);CHECK
      • Vars
        • Q(e);N_PINR(G),P_PINP(E),SBLOCK,XQ(F)::B(I)+R(G),DCHECK
      • Refutation
        • K(c);S_FLIGHT,XQ(F)
  • Actual
    • Q(F);
    • Threat
      • R(A)
    • Vars
      • Q(e);CHECK,OGATE,P_SPINQ(e),XR(G)::B(I),XQ(e)
      • Q(e);N_PINR(G),P_PINP(E)::B(I)+R(G),DCHECK
      • R(d);SBLOCK::QAB1(F)
      • Q(e);N_PINR(G)::B(I)+R(G),DCHECK
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